User's Manual

January
2016 DocID0xxxxx Rev 0.17
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change
without notice. www.st.com
6.2 UART interface
The UART is compatible with the 16550 industry standard. Four signals are provided with
the UART interface. The TXD and RXD pins are used for data while the CTS and RTS pins
are used for flow control.
Host
Bluetooth
module
$012027Y1
$012028Y1
Figure 6: Connection to host device
Figure 7: Typical RS232 circuit